Ive dated 2 girls in the past and both were overwhelmingly accepting of my stutter and very understanding. They wouldn’t ever bring it up to me, but anytime I felt frustrated about my stutter, they would be there to talk about it with me and hear me out on it. If someone is dating you and they know that part about you, they’ll never make you feel any less about it, and if you want to bring it up to her, I think you should! She’ll be receptive and it’ll strengthen your bond when she knows you brought up something so dear to you